Rotary pump.



No. 665,58I. `lla'nted Ian.*8, |90l.

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RUTARY PUMP.

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UNiTED "STATES PATENT Fries.

ROBERT ROE, JR., AND THOMAS E. ROE, OF PARSONS, WEST VIRGINIA,

ASSIGNORS TO THE BROWNVILLE IRON WORKS, OF BROWNVILLE, NEW

YORK.

ROTARY PU M P.

SPECIFICATION forming part of Letters Patent N o. 665,581, dated January8, 1901.

Application filed October 20, 1900. Serial No. 33,671. (No model.)

To all whom t may concern:

Beit known that we, ROBERT ROE, Jr., and THOMAS E. ROE, citizens of theUnited States, and residents of Parsons, in the county of Tucker andState of West Virginia, have invented a new and useful Improvement inRotary Pumps, of which the following is a specification. l

In centrifugal pumps the casing, the rotary ro wings or blades, and thehub to which the latter are secured are usually made of cast-iron orbronze, while the shaft is usually made of steel. When such a pump isused for pumping a liquid which attacks steel, but does not affectcast-iron or bronze injuriously, the steel shaft soon becomes unfit foruse and must be renewed, while the cast parts remain serviceable. Thebleach liquor used in the manufacture of soda pulp, for instance, is zovery destructive to steel, but has little, if any, detrimental effectupon cast-iron or bronze, and a pump of this kind, which is used forpumping this liquor quickly, becomes unserviceable by the corrosion ofthe shaft.

The object of our invention is to protect the steel shaft of such a pumpby the cast parts in such manner that the liquid is prevented fromcomingin contact with the shaft, thereby protecting the shaft againstthe destructive effect of the liquid.

In the accompanying drawings, Figure 1 is a vertical longitudinalsection of a centrifugal pump provided with our improvement. Fig. 2 isan end elevation of the'pump with the outer part of the casing removed.Fig. 3 is a longitudinal sectional view of the hub which carries therotary Wings and that part of the shaft to which the hub is secured,showing a modified construction of said hub.

Like letters of reference refer to like parts in the several figures.

A A' represent, respectively, theinner an outer parts of the casing` ofa centrifugal pump.

ais the induction-pipe,wliich is formed centrally on the outer part A ofthe casing, and b the eduction-pipe, which is formed partly on each ofthe parts A A and projects upwardly therefrom, as usual.

D is the stu'ng-box, which is supported on a bed-frame E and to whichthe central tubular portion d of the inner part A of the casingissecured. f is the gland of this stuffingbox.

G represents the shaft of the pump, which extends through thestuffing-box into the casing.

H represents the hub, which .carries the wings or blades I within thecasing. This hub is provided with an outward tubular extension h, whichextends into the stuffing-box and is packed by the latter. The extendedor elongated hub H h is secured to the shaft G, as shown in Fig. l, by akey It. The shaft extends from end to end of the elongated hub and isprovided with a screw-threaded end piece l, which projects beyond thehub. L represents a screw-cap of cast metal, which is applied to thisend piece and which makes a tight joint with the end of the hub. The hubis preferably recessed, as shown, for the reception of this cap, and asuitable packingwasher may be placed between the cap and the hub, ifdesired. The cap covers the end of the shaft and prevents access of theliquid to the shaft at the inner end of the latter. The elongated hubiucloses the shaft within the casing, and as it extends into thestuffing-box the liquid is prevented from reaching the shaft at anypoint within the casing.

In the modified construction (represented in Fig. 3) the shaft does notextend through the hub, but the latter is closed at its inner end andprovided with a screw threaded socket, by which it is screwed upon thescrewthreaded end piece Z of the shaft.

We claim as our inventionl. The combination with the shaft of a rotarypump and the casing provided with a stuffing-box through which saidshaft passes, of a hub which carries the rotary pumping device withinsaid casing and which is adapted to be applied to said shaft from theinner end thereof and provided with means for inclosing the inner end ofsaid shaft, said hub having an outward tubular extension which surroundssaidshaft and projects into said stuffing-box, and a fastening devicewhereby said huh is detaehahly securedto sai-d shaft, inner end of saidhuh and coveringthe inner to substantially as set forth. end of saidshaft, substantially as set forth.

2. The combination with the shaft of a ro- Witness our hands this 13thday of Octot-ary pump, of a oasinghaVingastufng-box bei', 1900.

through which said shaft', passes, a hub which ROBERT ROE, JR. carriesthe rotary pumping device within saidk THOMAS E. ROE. easing and Whichis provided with an out- Witnesses:

Ward extension which projects into said stu ff- A. JAY VALENTINE,

ing-box, and a protedbing-cap arranged at the BENJ. E. HUSBANDS.

